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or divided on 1024^2 = 41.2 Mb/s, as data rate with full 8-bit color-depth.

To calculate the projector/monitor's bandwidth you will need accurate timing measurement available, but you can get close by using the vertical frequency and compensate for VBLANK (vertical blanking which is a sync feature) with about 5% and HBLANK with about 30%:

So with 800x600 resolution at 60 hz:

800x1.3 x 600x1.05 x 60 = approx. 39 Mhz

The closer these two results get the better it is as that will tell that the projector/monitor is capable to handle the needed data rate to get full resolution, color depth as so forth.